A defoaming system based on physical treatment

Abstract

The utility model relates to a defoaming system based on physical treatment belongs to defoaming equipment field, including bubble -sucking device, ultrasonic defoamer, defoaming pump, bubble -sucking device includes the filter cartridge of closed shape, and the import pipe and export pipe are provided with respectively in the both ends of filter cartridge, and the import pipe of filter cartridge is connected with the extraction assembly for extracting foam through pipeline, and filter cotton is filled in filter cartridge, and the export pipe of filter cartridge is connected with reflux assembly through pipeline, ultrasonic defoamer includes ultrasonic vibration subassembly, and with ultrasonic vibration subassembly connection, is used for driving ultrasonic vibration subassembly high -frequency vibration's ultrasonic generator, defoaming pump includes the pump body and with the pump body connection, is used to suck the working end of foam and carries out the broken. The utility model can carry out efficient defoaming treatment through pure physical means to can dispense with the use of chemical defoaming agent, and then can eliminate the foam of developing solution and membrane stripping liquid effectively, and guarantee the quality of PCB finished product.

Description

Technical Field

[0001] This utility model relates to the field of defoaming equipment, and in particular to a defoaming system based on physical treatment. Background Technology

[0002] In the PCB manufacturing process, the developing and stripping processes are crucial for ensuring the accuracy of circuit patterns and realizing PCB functionality. The developing process involves a chemical reaction between the developing solution and the unexposed photoresist on the PCB substrate to remove excess photoresist and expose the intended circuit patterns. The stripping process uses a stripping solution to peel off the exposed and developed photoresist layer, laying the foundation for subsequent etching, electroplating, and other processes. However, during these two processes, the chemical composition of the developing and stripping solutions (such as alkaline substances and surfactants), as well as mechanical agitation and liquid flow impact, can easily generate a large amount of foam. This foam can adhere to the PCB substrate surface or the gaps between circuit patterns, hindering sufficient contact between the developing and stripping solutions and the photoresist, leading to incomplete development, stripping residue, and ultimately, defects such as short circuits and open circuits. Therefore, defoaming treatment of the developing and stripping solutions is necessary during PCB manufacturing.

[0003] Currently, due to the limited defoaming capacity of defoaming pumps, chemical defoamers are added to the developing solution and stripping solution during the production process, in addition to using defoaming pumps for defoaming treatment. These defoamers further disrupt the surface tension of the foam, suppressing and eliminating it, thus ensuring that the defoaming efficiency meets production requirements. However, as chemical agents, defoamers are prone to side reactions with the active substances in the developing solution and stripping solution, or to leaving residues on the PCB substrate surface. These side reaction products and residues not only alter the chemical reaction rate of developing and stripping, affecting the accuracy and clarity of the circuit patterns, but may also cause problems such as substrate corrosion and reduced plating adhesion in subsequent processes, ultimately affecting the quality of the finished PCB and leading to a reduction in PCB quality.

[0004] Based on this, the present invention provides a defoaming system based on physical treatment, which achieves efficient foam removal using only physical means, avoiding the quality risks caused by chemical defoamers, thereby ensuring the quality of PCB products while effectively eliminating foam from developer and stripping solutions. Utility Model Content

[0005] Based on this, the present invention provides a defoaming system based on physical processing, including a foam suction device, an ultrasonic defoaming device, and a defoaming pump. The foam suction device includes a closed filter cartridge with an inlet pipe and an outlet pipe at both ends. The inlet pipe of the filter cartridge is connected to an extraction component for extracting foam via a pipe. The filter cartridge is filled with filter cotton, and the outlet pipe of the filter cartridge is connected to a return component via a pipe. The ultrasonic defoaming device includes an ultrasonic vibration component and an ultrasonic generator connected to the ultrasonic vibration component for driving the ultrasonic vibration component to vibrate at high frequency. The defoaming pump includes a pump body and a working end connected to the pump body for sucking up foam and breaking it up.

[0006] Furthermore, the extraction component is a diaphragm pump.

[0007] Furthermore, the ultrasonic vibration assembly includes a vibrating plate, on which a transducer connected to the ultrasonic generator via a high-frequency line is fixedly mounted.

[0008] Furthermore, it also includes a mounting bracket, on which a defoaming tank is fixedly connected; the defoaming pump is fixedly mounted on the mounting bracket, and the working end of the defoaming pump extends into the defoaming tank; the ultrasonic vibration component of the ultrasonic defoaming device is installed in the defoaming tank, and the horizontal height of the ultrasonic vibration component is lower than the horizontal height of the working end; a suction nozzle is installed in the defoaming tank corresponding to the bubble suction device, the suction nozzle is connected to the extraction component of the bubble suction device through a pipe, and the suction nozzle and the working end are at the same horizontal height; the return component of the bubble suction device is connected to the defoaming tank.

[0009] Furthermore, the mounting bracket also includes a cover plate covering the defoaming tank, the defoaming pump is mounted on the cover plate, and the working end of the defoaming pump is located below the cover plate. The reflux assembly is tubular and mounted on the cover plate, with the upper end and lower end of the reflux assembly located above and below the cover plate, respectively. The outlet pipe of the filter cartridge is connected to the upper end of the reflux assembly through a pipe.

[0010] Furthermore, the cover plate is provided with an observation window.

[0011] Furthermore, the suction nozzle has a horizontally oriented tubular structure, and the cross-sectional area of ​​the suction nozzle gradually increases along the direction away from the extraction component.

[0012] The principle and effects of this utility model will be further explained below with reference to the above technical solution and the accompanying drawings: In this invention, the foam in the liquid medium can be efficiently eliminated through the synergistic action of the bubble suction device, the ultrasonic defoaming device, and the defoaming pump, thereby eliminating the need for chemical defoamers. This effectively eliminates foam in the developer and stripping solution while ensuring the quality of the finished PCB product. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the defoaming system based on physical processing described in an embodiment of the present invention.

[0014] Attached Figure

[0015] 1-Mounting bracket, 11-Cover plate, 111-Observation window, 2-Defoaming tank, 21-Overflow port, 31-Filter cartridge, 32-Extraction assembly, 33-Suction nozzle, 34-Recirculation assembly, 41-Ultrasonic generator, 42-Ultrasonic vibration assembly, 43-High frequency line, 5-Defoaming pump. Detailed Implementation

[0016] To facilitate understanding by those skilled in the art, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. In this description, directional terms such as up, down, left, and right are all used in conjunction with the accompanying drawings. Figure 1 For reference: like Figure 1 A defoaming system based on physical processing includes a foam suction device, an ultrasonic defoaming device, and a defoaming pump 5. The foam suction device includes a closed filter cartridge 31 with an inlet pipe and an outlet pipe at both ends. The inlet pipe of the filter cartridge 31 is connected to an extraction component 32 for extracting foam via a pipe. The filter cartridge 31 is filled with filter cotton, and the outlet pipe of the filter cartridge 31 is connected to a return component 34 via a pipe. The ultrasonic defoaming device includes an ultrasonic vibration component 42 and an ultrasonic generator 41 connected to the ultrasonic vibration component 42 for driving the ultrasonic vibration component 42 to vibrate at high frequency. The defoaming pump 5 includes a pump body and a working end connected to the pump body for sucking up and breaking up foam.

[0017] In this invention, the defoaming system includes a foam suction device, an ultrasonic defoaming device, and a defoaming pump 5, which are used to defoam the liquid medium in multiple dimensions to achieve the effect of efficiently eliminating foam in the liquid medium, thereby eliminating the need for defoaming agents.

[0018] The bubble suction device is used to extract foam from the surface of the liquid medium via the extraction component 32. After the extracted foam enters the filter cartridge 31, it will be broken by the pressure of the filter cotton pore wall and return to the liquid state. Then, it will flow back to the liquid medium through the return component 34, thereby achieving the purpose of defoaming. The ultrasonic vibration component 42 of the ultrasonic device needs to be placed in the liquid medium for use. After the high-frequency vibration (>20kHz) of the ultrasonic vibration component is transmitted into the liquid medium, it will form periodic pressure fluctuations inside the liquid medium. These fluctuations will trigger the cavitation effect, causing the tiny "nuclei" formed by the gas in the liquid medium to expand and contract violently under the alternating pressure, thereby breaking down and preventing the generation of foam. The defoaming pump 5 adopts the existing technology of defoaming pump 5, which uses an impeller to suck up the foam. The sucked-up foam will be broken by the impact of the impeller and the centrifugal force, thereby achieving the effect of eliminating foam.

[0019] As can be seen, in this utility model, the foam in the liquid medium can be efficiently eliminated through the synergistic effect of the bubble suction device, the ultrasonic defoaming device and the defoaming pump 5, thereby eliminating the need for chemical defoamers. In this way, the quality of the finished PCB product can be guaranteed while effectively eliminating foam in the developer and stripping solution.

[0020] In addition, when the defoaming device extracts foam, impurities in the foam will also enter the filter cartridge 31 along with the foam and be filtered by the filter cotton. Therefore, the defoaming device also has the effect of filtering liquid media.

[0021] In one embodiment, the extraction component 32 is a diaphragm pump.

[0022] In this embodiment, the diaphragm pump adopts a pneumatic drive structure, which can operate without damage under completely idle and dry suction conditions. Therefore, it is suitable for foam extraction and will not be damaged due to lack of liquid cooling and lubrication. At the same time, the working chamber of the diaphragm pump is completely isolated from the transmission components, making it suitable for foam containing impurity particles.

[0023] In one embodiment, the ultrasonic vibration assembly 42 includes a vibrating plate, on which a transducer is fixedly disposed and connected to the ultrasonic generator 41 via a high-frequency line 43.

[0024] In this embodiment, the transducer converts the electrical energy of the ultrasonic generator 41 into mechanical vibration energy and transmits this mechanical vibration energy to the vibrating plate, causing the vibrating plate to vibrate at high frequency. The transducer requires sealing and encapsulation, for example, using an epoxy resin potting process to completely encapsulate the piezoelectric ceramic sheet and electrode leads of the transducer within the epoxy resin. After potting, the transducer and the vibrating plate are securely connected by stainless steel bolts to ensure lossless transmission of vibration energy. Preferably, the vibrating plate is made of 304 stainless steel with a sandblasted surface to increase the contact area with the liquid medium, allowing the vibration energy to diffuse more evenly into the liquid medium.

[0025] One embodiment further includes a mounting frame 1, on which a defoaming tank 2 is fixedly connected; a defoaming pump 5 is fixedly mounted on the mounting frame 1, and the working end of the defoaming pump 5 extends into the defoaming tank 2; an ultrasonic vibration component 42 of the ultrasonic defoaming device is installed in the defoaming tank 2, and the horizontal height of the ultrasonic vibration component 42 is lower than the horizontal height of the working end; a suction nozzle 33 is installed in the defoaming tank 2 corresponding to the foam suction device, the suction nozzle 33 is connected to the extraction component 32 of the foam suction device through a pipe, and the suction nozzle 33 and the working end are at the same horizontal height; the return component 34 of the foam suction device is connected to the defoaming tank 2.

[0026] In this embodiment, the defoaming tank 2 can be set up independently or it can be part of the PCB production equipment, such as the developing tank or the stripping tank of the PCB production equipment, to contain the liquid medium to be defoamed.

[0027] In this embodiment, the suction nozzle 33 is at the same horizontal height as the working end of the defoaming pump 5, and needs to be located above and close to the liquid surface to facilitate timely suction of foam generated by the liquid medium. Correspondingly, the ultrasonic vibration component 42, which is at a horizontal height lower than the working end of the defoaming pump 5, is located inside the liquid medium to facilitate the suppression of foam generation in the liquid medium through vibration. Preferably, the defoaming tank 2 is provided with an overflow port 21, and the working end of the defoaming pump 5 and the suction nozzle 33 are set at the same height as the overflow port 21, so that the working end of the defoaming pump 5 and the suction nozzle 33 can always be at the liquid surface of the liquid medium.

[0028] In this embodiment, the ultrasonic generator 41 of the ultrasonic defoaming device, as well as the extraction component 32 and filter cartridge 31 of the bubble suction device, can be selectively installed on the mounting frame 1 or set independently of the mounting frame 1.

[0029] In one embodiment, the mounting bracket 1 further includes a cover plate 11 covering the defoaming tank 2, the defoaming pump 5 is mounted on the cover plate 11, and the working end of the defoaming pump 5 is located below the cover plate 11. The reflux assembly 34 is tubular and mounted on the cover plate 11, with the upper end and lower end of the reflux assembly 34 located above and below the cover plate 11, respectively. The outlet pipe of the filter cartridge 31 is connected to the upper end of the reflux assembly 34 through a pipe.

[0030] In this embodiment, the cover plate 11 can protect the defoaming tank 2, prevent the liquid medium in the defoaming tank 2 from splashing out, and prevent foreign objects in the environment from entering the liquid medium.

[0031] In one embodiment, the cover plate 11 has an observation window 111.

[0032] In this embodiment, the observation window 111 allows for convenient observation of the liquid medium in the defoaming tank 2, facilitating real-time monitoring of the liquid level, foam generation, and defoaming effect of the liquid medium in the defoaming tank 2 by the operator.

[0033] In one embodiment, the suction nozzle 33 has a horizontally placed tubular structure, and the cross-sectional area of ​​the suction nozzle 33 gradually increases along the direction away from the extraction component 32.

[0034] In this embodiment, the cross-sectional area of ​​the suction nozzle 33 gradually increases along the direction away from the extraction component 32, which can increase the effective suction range of the extraction component 32 for foam, and correspondingly improve the quantity and efficiency of foam extraction by the extraction component 32. Preferably, the suction nozzle 33 is flat and tubular to further adapt to the distribution characteristics of foam on the surface of the liquid medium. Compared with a circular tubular structure, the flat and tubular design can increase the contact width between the suction nozzle 33 and the liquid surface, allowing the suction nozzle 33 to cover a wider area of ​​surface foam at the same time.

[0035] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

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